Mask



FIG. 1 is a perspective view of a mask embodying my design;

FIG. 2 is an elevational front view thereof;

FIG. 3 is an elevational rear view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a mask, as shown and described. 